[Ffmpeg-devel] [PATCH] AC-3 encoder volume
Sun Mar 18 23:20:51 CET 2007
On Sun, Mar 18, 2007 at 04:51:19PM -0500, Justin Ruggles wrote:
> Hi everyone,
> This bug has been bothering me for a while. The AC-3 encoder is
> producing output with too high volume, which even results in clipping in
> many cases.
> The attached patch fixes the problem and updates regressions. Here is a
> little history. Revision 5281 changed v-8 to v-9. Revision 7160
> changed v-9 to v-10. But after that change I've found the resulting
> file to be noticeably too loud when played.
> To avoid basing the argument on my ears, I've attached a comparison I
> did with a mono clip of a 1kHz tone at 85% of full dynamic range. The
> screen shot shows 3 different files in Audacity. The top box is the
> original file, offset by 256 samples to account for the AC-3 delay. The
> middle box is the results from encoding _without_ the patch, then
> decoding with a52dec. The bottom box is the results from encoding
> _with_ the patch, then decoding with a52dec.
patch ok, and please cite the whole commit message of the commit this
reverses (with revision number ...) in the new commit message
Michael GnuPG fingerprint: 9FF2128B147EF6730BADF133611EC787040B0FAB
I count him braver who overcomes his desires than him who conquers his
enemies for the hardest victory is over self. -- Aristotle
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